Support sha256 which requires 64-char keys
Merge pull request #8 from eshamow/support_sha256_hashes

Support sha256 which requires 64-char keys
Fix PE detection.
Merge pull request #11 from nanliu/pe

Fix PE detection.
Add working spec tests.
Add travis ci notification.
Merge pull request #12 from nanliu/spec

Add working spec tests.